I'm sure there are a number of them here. I would point to a few but I think you are referring to "pure" lesbians while the ones I know are mtf trans couples. ^^;
It just feels lonely on this site since most of the clients I draw for and people I meet on here are dudes v_v I'm glad to know there are more ladies here too
I see some artwork with F/F actions but they are not wildly represented here